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The Radio/Gamma-Ray Connection In Active Galactic Nuclei In The Era Of The Fermi Large Area Telescope

Ackermann, M.; Ajello, M.; Allafort, A.; Angelakis, E.; Axelsson, Magnus LU ; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D. and Bellazzini, R., et al. (2011) In Astrophysical Journal 741(1).
Abstract
We present a detailed statistical analysis of the correlation between radio and gamma-ray emission of the active galactic nuclei (AGNs) detected by Fermi during its first year of operation, with the largest data sets ever used for this purpose. We use both archival interferometric 8.4 GHz data (from the Very Large Array and ATCA, for the full sample of 599 sources) and concurrent single-dish 15 GHz measurements from the Owens Valley Radio Observatory (OVRO, for a sub sample of 199 objects). Our unprecedentedly large sample permits us to assess with high accuracy the statistical significance of the correlation, using a surrogate data method designed to simultaneously account for common-distance bias and the effect of a limited dynamical... (More)
We present a detailed statistical analysis of the correlation between radio and gamma-ray emission of the active galactic nuclei (AGNs) detected by Fermi during its first year of operation, with the largest data sets ever used for this purpose. We use both archival interferometric 8.4 GHz data (from the Very Large Array and ATCA, for the full sample of 599 sources) and concurrent single-dish 15 GHz measurements from the Owens Valley Radio Observatory (OVRO, for a sub sample of 199 objects). Our unprecedentedly large sample permits us to assess with high accuracy the statistical significance of the correlation, using a surrogate data method designed to simultaneously account for common-distance bias and the effect of a limited dynamical range in the observed quantities. We find that the statistical significance of a positive correlation between the centimeter radio and the broadband (E > 100 MeV) gamma-ray energy flux is very high for the whole AGN sample, with a probability of < 10(-7) for the correlation appearing by chance. Using the OVRO data, we find that concurrent data improve the significance of the correlation from 1.6 x 10(-6) to 9.0 x 10(-8). Our large sample size allows us to study the dependence of correlation strength and significance on specific source types and gamma-ray energy band. We find that the correlation is very significant (chance probability < 10(-7)) for both flat spectrum radio quasars and BL Lac objects separately; a dependence of the correlation strength on the considered gamma-ray energy band is also present, but additional data will be necessary to constrain its significance. (Less)
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keywords
BL Lacertae objects: general, galaxies: active, galaxies: jets, gamma, rays: galaxies, radio continuum: galaxies, quasars: general
in
Astrophysical Journal
volume
741
issue
1
publisher
University of Chicago Press
external identifiers
  • wos:000296769000030
  • scopus:80155149354
ISSN
0004-637X
DOI
10.1088/0004-637X/741/1/30
language
English
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yes
id
4aee03cd-11a5-4d9b-9410-f7186e9c8fb2 (old id 2253404)
date added to LUP
2011-12-21 11:19:43
date last changed
2017-11-05 04:10:27
@article{4aee03cd-11a5-4d9b-9410-f7186e9c8fb2,
  abstract     = {We present a detailed statistical analysis of the correlation between radio and gamma-ray emission of the active galactic nuclei (AGNs) detected by Fermi during its first year of operation, with the largest data sets ever used for this purpose. We use both archival interferometric 8.4 GHz data (from the Very Large Array and ATCA, for the full sample of 599 sources) and concurrent single-dish 15 GHz measurements from the Owens Valley Radio Observatory (OVRO, for a sub sample of 199 objects). Our unprecedentedly large sample permits us to assess with high accuracy the statistical significance of the correlation, using a surrogate data method designed to simultaneously account for common-distance bias and the effect of a limited dynamical range in the observed quantities. We find that the statistical significance of a positive correlation between the centimeter radio and the broadband (E &gt; 100 MeV) gamma-ray energy flux is very high for the whole AGN sample, with a probability of &lt; 10(-7) for the correlation appearing by chance. Using the OVRO data, we find that concurrent data improve the significance of the correlation from 1.6 x 10(-6) to 9.0 x 10(-8). Our large sample size allows us to study the dependence of correlation strength and significance on specific source types and gamma-ray energy band. We find that the correlation is very significant (chance probability &lt; 10(-7)) for both flat spectrum radio quasars and BL Lac objects separately; a dependence of the correlation strength on the considered gamma-ray energy band is also present, but additional data will be necessary to constrain its significance.},
  author       = {Ackermann, M. and Ajello, M. and Allafort, A. and Angelakis, E. and Axelsson, Magnus and Baldini, L. and Ballet, J. and Barbiellini, G. and Bastieri, D. and Bellazzini, R. and Berenji, B. and Blandford, R. D. and Bloom, E. D. and Bonamente, E. and Borgland, A. W. and Bouvier, A. and Bregeon, J. and Brez, A. and Brigida, M. and Bruel, P. and Buehler, R. and Buson, S. and Caliandro, G. A. and Cameron, R. A. and Cannon, A. and Caraveo, P. A. and Casandjian, J. M. and Cavazzuti, E. and Cecchi, C. and Charles, E. and Chekhtman, A. and Cheung, C. C. and Ciprini, S. and Claus, R. and Cohen-Tanugi, J. and Cutini, S. and de Palma, F. and Dermer, C. D. and do Couto e Silva, E. and Drell, P. S. and Dubois, R. and Dumora, D. and Escande, L. and Favuzzi, C. and Fegan, S. J. and Focke, W. B. and Fortin, P. and Frailis, M. and Fuhrmann, L. and Fukazawa, Y. and Fusco, P. and Gargano, F. and Gasparrini, D. and Gehrels, N. and Giglietto, N. and Giommi, P. and Giordano, F. and Giroletti, M. and Glanzman, T. and Godfrey, G. and Grandi, P. and Grenier, I. A. and Guiriec, S. and Hadasch, D. and Hayashida, M. and Hays, E. and Healey, S. E. and Johannesson, G. and Johnson, A. S. and Kamae, T. and Katagiri, H. and Kataoka, J. and Knoedlseder, J. and Kuss, M. and Lande, J. and Lee, S. -H. and Longo, F. and Loparco, F. and Lott, B. and Lovellette, M. N. and Lubrano, P. and Makeev, A. and Max-Moerbeck, W. and Mazziotta, M. N. and McEnery, J. E. and Mehault, J. and Michelson, P. F. and Mizuno, T. and Monte, C. and Monzani, M. E. and Morselli, A. and Moskalenko, I. V. and Murgia, S. and Naumann-Godo, M. and Nishino, S. and Nolan, P. L. and Norris, J. P. and Nuss, E. and Ohsugi, T. and Okumura, A. and Omodei, N. and Orlando, E. and Ormes, J. F. and Ozaki, M. and Paneque, D. and Pavlidou, V. and Pelassa, V. and Pepe, M. and Pesce-Rollins, M. and Pierbattista, M. and Piron, F. and Porter, T. A. and Raino, S. and Razzano, M. and Readhead, A. and Reimer, A. and Reimer, O. and Richards, J. L. and Romani, R. W. and Sadrozinski, H. F. -W. and Scargle, J. D. and Sgro, C. and Siskind, E. J. and Smith, P. D. and Spandre, G. and Spinelli, P. and Strickman, M. S. and Suson, D. J. and Takahashi, H. and Tanaka, T. and Taylor, G. B. and Thayer, J. G. and Thayer, J. B. and Thompson, D. J. and Torres, D. F. and Tosti, G. and Tramacere, A. and Troja, E. and Vandenbroucke, J. and Vianello, G. and Vitale, V. and Waite, A. P. and Wang, P. and Winer, B. L. and Wood, K. S. and Yang, Z. and Ziegler, M.},
  issn         = {0004-637X},
  keyword      = {BL Lacertae objects: general,galaxies: active,galaxies: jets,gamma,rays: galaxies,radio continuum: galaxies,quasars: general},
  language     = {eng},
  number       = {1},
  publisher    = {University of Chicago Press},
  series       = {Astrophysical Journal},
  title        = {The Radio/Gamma-Ray Connection In Active Galactic Nuclei In The Era Of The Fermi Large Area Telescope},
  url          = {http://dx.doi.org/10.1088/0004-637X/741/1/30},
  volume       = {741},
  year         = {2011},
}